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<h1>libdill: Structured Concurrency for C</h1>

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<h1 id="name">NAME</h1>
<p>tcp_accept - accepts an incoming TCP connection</p>
<h1 id="synopsis">SYNOPSIS</h1>
<div class="sourceCode"><pre class="sourceCode c"><code class="sourceCode c"><span class="pp">#include </span><span class="im">&lt;libdill.h&gt;</span>

<span class="dt">int</span> tcp_accept(
    <span class="dt">int</span> s,
    <span class="kw">struct</span> ipaddr* addr,
    <span class="dt">int64_t</span> deadline);</code></pre></div>
<h1 id="description">DESCRIPTION</h1>
<p>TCP protocol is a reliable bytestream protocol for transporting data over network. It is defined in RFC 793.</p>
<p>This function accepts an incoming TCP connection.</p>
<p><strong>s</strong>: Socket created by <strong>tcp_listen</strong>.</p>
<p><strong>addr</strong>: Out parameter. IP address of the connecting endpoint. Can be <strong>NULL</strong>.</p>
<p><strong>deadline</strong>: A point in time when the operation should time out, in milliseconds. Use the <strong>now</strong> function to get your current point in time. 0 means immediate timeout, i.e., perform the operation if possible or return without blocking if not. -1 means no deadline, i.e., the call will block forever if the operation cannot be performed.</p>
<p>The socket can be cleanly shut down using <strong>tcp_close</strong> function.</p>
<p>This function is not available if libdill is compiled with <strong>--disable-sockets</strong> option.</p>
<h1 id="return-value">RETURN VALUE</h1>
<p>In case of success the function returns handle of the new connection. In case of error it returns -1 and sets <strong>errno</strong> to one of the values below.</p>
<h1 id="errors">ERRORS</h1>
<ul>
<li><strong>EBADF</strong>: Invalid handle.</li>
<li><strong>ECANCELED</strong>: Current coroutine was canceled.</li>
<li><strong>EMFILE</strong>: The maximum number of file descriptors in the process are already open.</li>
<li><strong>ENFILE</strong>: The maximum number of file descriptors in the system are already open.</li>
<li><strong>ENOMEM</strong>: Not enough memory.</li>
<li><strong>ENOTSUP</strong>: The handle does not support this operation.</li>
<li><strong>ETIMEDOUT</strong>: Deadline was reached.</li>
</ul>
<h1 id="example">EXAMPLE</h1>
<div class="sourceCode"><pre class="sourceCode c"><code class="sourceCode c"><span class="kw">struct</span> ipaddr addr;
ipaddr_local(&amp;addr, NULL, <span class="dv">5555</span>, <span class="dv">0</span>);
<span class="dt">int</span> ls = tcp_listen(&amp;addr, <span class="dv">10</span>);
<span class="dt">int</span> s = tcp_accept(ls, NULL, <span class="dv">-1</span>);
bsend(s, <span class="st">&quot;ABC&quot;</span>, <span class="dv">3</span>, <span class="dv">-1</span>);
<span class="dt">char</span> buf[<span class="dv">3</span>];
brecv(s, buf, <span class="kw">sizeof</span>(buf), <span class="dv">-1</span>);
tcp_close(s);
tcp_close(ls);</code></pre></div>
<h1 id="see-also">SEE ALSO</h1>
<p><strong>brecv</strong>(3) <strong>brecvl</strong>(3) <strong>bsend</strong>(3) <strong>bsendl</strong>(3) <strong>hclose</strong>(3) <strong>now</strong>(3) <strong>tcp_accept_mem</strong>(3) <strong>tcp_close</strong>(3) <strong>tcp_connect</strong>(3) <strong>tcp_connect_mem</strong>(3) <strong>tcp_done</strong>(3) <strong>tcp_fromfd</strong>(3) <strong>tcp_fromfd_mem</strong>(3) <strong>tcp_listen</strong>(3) <strong>tcp_listen_mem</strong>(3) <strong>tcp_listener_fromfd</strong>(3) <strong>tcp_listener_fromfd_mem</strong>(3)</p>
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